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Many maintain that the primary cause of the war was the Southern states' desire to preserve the institution of slavery. Others minimize slavery and point to other factors, such as taxation or the principle of States' Rights. Two major themes emerge in these documents: slavery and states' rights.
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The women helped their families during the Great Depression by cooking and cleaning when their husbands were at work or protesting or looking for work. They cooked and cleaned and got alot less appreciation than they deserved. :(
If the change in values of one set doesn't affect the values of the other, then the variables are said to have "no correlation" or "zero correlation." A causal relation between two events exists if the occurrence of the first causes the other.